Tools // Component Selector // Flash Hobby
Flash Hobby 2004 KV2100
hobby fpv brushless motor. Specs read from manufacturer page ↗.
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Specifications
| Brand | Flash Hobby |
|---|---|
| Model | 2004 |
| Variant | KV2100 |
| KV | 2,100 |
| Stator | 21*42 mm |
| Weight | 56 g |
| Max thrust | 945 g |
| Max current | 17.4 A |
| Max power | 426 W |
| Peak power | 426 W |
| Poles | 12 |
| Shaft diameter | 4.0 mm |
| Hover efficiency | 4.35 g/W |
| Peak-throttle efficiency | 2.22 g/W |
| Grade | hobby |
| Application | fpv |
| Data confidence | reported |
| Thrust basis | measured |
| Efficiency basis | measured |
| Measured test points | 5 |
Measured thrust curve
Where to buy
| Vendor | Price | As listed | Stock | Lead days | |
|---|---|---|---|---|---|
| Pyrodrone US | A$22.98 | USD 15.99 | in stock | 14 | buy ↗ |
Multi-pack listings are shown at their per-unit price so they stay comparable.
Thrust test points
| Propeller | Cells | Thrust g | g/W | Basis |
|---|---|---|---|---|
| unspecified | — | 945 | 2.22 | measured |
| unspecified | — | 847 | 2.50 | measured |
| unspecified | — | 701 | 2.83 | measured |
| unspecified | — | 538 | 3.34 | measured |
| unspecified | — | 396 | 4.35 | measured |
Compatible accessories
Parts this catalogue holds that fit this component, and the evidence behind each pairing. Fit is inferred from published specifications, not from having tried it. Confirm mounting and clearance before you buy.
rule of thumb The size conventionally run on a stator this big. Not a measurement -- check clearance and current draw before flying it.
| Accessory | Type | From |
|---|---|---|
| Team 5x4.5 3-blade propeller | propeller | A$1.10 |
| Gemfan 5.1x3 3-blade propeller | propeller | A$1.25 |
| DALprop 5" 3-blade propeller | propeller | A$1.49 |
| Gemfan 4.9x3.7 3-blade propeller | propeller | A$1.49 |
| Gemfan 4.9x3.4 3-blade propeller | propeller | A$1.49 |
| HQProp 5.1x4.2 3-blade propeller | propeller | A$1.49 |
| HQProp 5.1x3.6 3-blade propeller | propeller | A$1.79 |
| Gemfan 5.1x4.4 3-blade propeller | propeller | A$1.79 |
| Gemfan 5.1x4.9 3-blade propeller | propeller | A$1.86 |
| Gemfan 5.2x3.6 3-blade propeller | propeller | A$1.90 |
| T-Hobby 4.9" propeller | propeller | A$2.20 |
| T-Motor 4.9" propeller | propeller | A$2.20 |
CAD model
No CAD model linked yet.
How the metrics are calculated
TWR is max thrust divided by motor weight, motor only, static, excluding propeller and ESC. EFTWR scales that by hover efficiency and RPM headroom, so it equals TWR for a motor at 8 g/W and 10,000 RPM. Full methodology and the whole catalogue →